Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea

Type Article
Date 2006-06
Language English
Author(s) Fourre E1, Jean Baptiste P1, Charlou Jean-Luc2, Donval Jean-Pierre2, Ishibashi J3
Affiliation(s) 1 : CEA Saclay, CEA, CNRS, UMR 1572,IPSL LSCE, F-91191 Gif Sur Yvette, France.
2 : IFREMER, DRO GM, Ctr Brest, F-29280 Plouzane, France.
3 : Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka 8128581, Japan.
Source Geochemical Journal (0016-7002) (Terrapub), 2006-06 , Vol. 40 , N. 3 , P. 245-252
DOI 10.2343/geochemj.40.245
WOS© Times Cited 15
Keyword(s) Western Pacific, Manus Basin, Back arc basins, Hydrothermal fluids, Helium isotopes
Abstract We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with He-3/He-4 values (7.4 to 7.9 R-a) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 +/- 0.1 R-a) are observed. The causal link between the narrow spatial extent of the He-3/He-4 anomaly at the MSC and a He-3-rich deep mantle component remains elusive, based on available geophysical data. Thus, the Manus Spreading Center results may be an interesting example of small scale upper-mantle heterogeneity.
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